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Employee Benefit Plans (Additional Information For Share Based Compensation) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Mar. 31, 2022
USD ($)
installment
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Mar. 28, 2022
shares
Mar. 31, 2019
shares
Employee Benefit Plan          
Share-based compensation expenses capitalized as inventory | $ $ 1.1 $ 1.1 $ 0.9    
Percent of granted and vested of target number 100.00%        
Exercise price, lower range limit (in dollars per share) | $ / shares $ 8        
Exercise price, upper range limit (in dollars per share) | $ / shares $ 80        
Tax benefit realized for the tax deduction from options exercised | $ $ 1.2 $ 0.6 $ 0.1    
1996 ESPP and 2006 ESPP          
Employee Benefit Plan          
Purchase price of shares expressed as percentage of the fair market value 85.00%        
Offering period of ESPP Plan 6 months        
Number of shares reserved for issuance (in shares) 29,000        
Number of shares available for issuance (in shares) 4,100        
2006 Plan          
Employee Benefit Plan          
Number of shares reserved for issuance (in shares) 30,600        
Number of shares available for issuance (in shares) 6,400        
2012 Stock Inducement Equity Plan          
Employee Benefit Plan          
Number of shares authorized under expired plan (in shares)       1,800  
Stock Options | 2006 Plan          
Employee Benefit Plan          
Expiration period 10 years        
Market-based and performance-based RSUs          
Employee Benefit Plan          
RSUs outstanding (in shares) 800        
Market-based and performance-based RSUs | 2006 Plan          
Employee Benefit Plan          
Performance period 3 years        
TSR Period 3 years        
Restricted Stock Units (RSUs)          
Employee Benefit Plan          
RSUs outstanding (in shares) 3,046 3,643 3,951   4,421
Tax benefit realized for the tax deduction from RSUs vested during period | $ $ 25.2 $ 16.3 $ 12.1    
Minimum | Time-based RSUs | 2006 Plan          
Employee Benefit Plan          
Vesting installment | installment 3        
Maximum | Time-based RSUs | 2006 Plan          
Employee Benefit Plan          
Vesting installment | installment 4